Insulation removing tool



June 13, 1950 H. J. SCHWAB INSULATION REMOVING TOOL Filed Aug. l, 1945 III. L

INVENToR. Hon/afd J Schn/ab ATTORNEY Patented June 13, 1950 UNITED STATES PATENT OFFICE.

INSULATION REMovING TooL Howard J. Schwab, New York, N. Y. Application August 1, i945, serial No. 608,333

(o1. zii- 9.5)

(Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) 2 Claims.

This invention relates to a tool for removing insulation from wire in such a manner that the insulation is in an undamaged condition for laboratory tests.

Previous to this invention the insulation was removed by clamping one end of the wire in a vise and pulling the insulation off with bare hands. This resulted in tearing or bulging of the insulation and also frequently injured the hands.

An object of this invention is to provide a tool for rapidly removing insulation from wire.

A further object is to provide a tool for removing the insulation from relatively short test samples of wire Without dam-age to or distortion of the insulation so that the insulation in substantially its original condition can be subjected to laboratory tests.

Further objects and advantages of this invention as well as its construction, arrangement and operation will be apparent from the following description and claims in connection with the accompanying drawing iin which:

Fig. 1 is a plan view of the present device;

Fig. 2 is a side elevational view;

Fig. 3 is a sectional View taken on line 3-3 of Fig. 1, and

Fig. 4 is a sectional view similar to Fig. 3 showing the device in use.

A preferred embodiment of the present invention comprises an elongated cylindrical body portion I@ preferably rounded at one end. The body portion is provided with a central longitudinal bore l i having a reduced portion I2 adjacent the rounded end. A tap-ered shoulder I3 joins bore II and reduced portion I2. As shown in Fig. 4, the larger bore portion I I is of a diameter adapted to receive a section of insulated wire Iii snugly therein while the reduced bore portion I2 is of a diameter to nt closely about the metal core I5 of the wire.

In the use of the invention one end of a short piece of wire It has a small part of the insulation removed by conventional means, such as a knife, leaving a stripped metal portion IS at one end which stripped portion is inserted through bores I I and l2 and extends through the rounded end of the device a distance sufli-cient to allow clamping in the jaws Il and i8 of some clamping device such as a vise, pliers or a similar tool.

As can be seen clearly in Fig. 4, the bare metal portion I5 fits snugly in bore I2 and likewise the insulated portion fits snugly in bore I I. When the device is pulled away from the jaws, tapered shoulder I3 presses firmly against the insulation I9 removing it from the metal portion I5 of the wire. This may be called stripping the wire. The restraining eiect of the walls of bore I I prevents the insulation from being damaged either by tearing or the tendency to bulge as would be the case in the former practice of pulling the insulation off with bare hands.

Use of this tool yconsiderably reduces the time required to remove the insulation from a short specimen of wire for laboratory tests.

Changes can be made in this invention without departing from the spirit and scope thereof as set forth in the appended claims.

The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

l/Vhat is claimed is:

1. A tool comprising an elongated tubular body having an elongated bore of one diameter formed therein, and extending inwardly from one end of said body, said bore being of an axial length equal to several times its own diameter, said body having formed therein only a second bore, the second bore being in alignment with the first named bore and of less diameter than the first named bore, said second bore opening at the other end of said body, said body being formed with the bores interconnected in an area deiined by a continuous tapered wall, said body at every transverse plane along its length being unitary and forming a continuous smooth wall about the bore, said body being free from openings other than the bore openings at opposite ends of said body.

2. A tool .for stripping 'insulation from a Wire, said tool comprising an elongated tubular body having an elongated bore of one diameter formed therein and extending inwardly from one end of said body, said bore being of an axial length equal to several times its own diameter, said diameter being substantially the same as the outside diameter of the insulation on the wire to be stripped, said body having formed therein a second bore in alignment with the rst named bore and of less diameter than the first named bore, said second bore opening at the other end of said body, the diameter of the smaller bore being substantially the same as the outside diameter oi the wire to be stripped, said body being formed with the bores inter-connected in an area defined by a continuous tapered wall so that if insulated wire is fed into the larger bore and then forced through the smaller bore the tapered wall prevents passage of insulation into the smaller bore and the insulation is retained in the larger bore while the stripped Wire passes through the smaller bore, the Wall of the larger bore serving to protect the stripped insulation from bulging or tearing, said body being free from openings other than the bore openings at opposite ends of said body.

HOWARD J. SCHWAB.

REFERENCES CITED The following references are of record in the iile of this patent:

4 UNITED STATES PATENTS Name Date Graham Sept. 16, 1884 Bernard May 8, 1900 Sibley Apr. 29, 1902 Hafner July 7, 1914 Miller Mar. 30, 1926 Montgomery Oct. 8, 1929 

